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Boris
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import java.awt.*;
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import java.awt.event.*;
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import java.awt.image.*;
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import javax.swing.*;
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import javax.swing.border.*;
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import java.io.File;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Iterator;
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/**
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* ImageViewer is the main class of the image viewer application. It builds and
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* displays the application GUI and initialises all other components.
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*
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* To start the application, create an object of this class.
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*
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* @author Michael Kölling and David J. Barnes.
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* @version 3.1
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*/
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public class ImageViewer
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{
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// static fields:
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private static final String VERSION = "Version 3.1";
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private static JFileChooser fileChooser = new JFileChooser(System.getProperty("user.dir"));
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// fields:
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private JFrame frame;
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private ImagePanel imagePanel;
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private JLabel filenameLabel;
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private JLabel statusLabel;
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private JButton smallerButton;
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private JButton largerButton;
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private OFImage currentImage;
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private List<Filter> filters;
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/**
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* Create an ImageViewer and display its GUI on screen.
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*/
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public ImageViewer()
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{
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currentImage = null;
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filters = createFilters();
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makeFrame();
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}
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// ---- implementation of menu functions ----
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/**
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* Open function: open a file chooser to select a new image file,
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* and then display the chosen image.
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*/
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private void openFile()
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{
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int returnVal = fileChooser.showOpenDialog(frame);
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if(returnVal != JFileChooser.APPROVE_OPTION) {
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return; // cancelled
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}
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File selectedFile = fileChooser.getSelectedFile();
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currentImage = ImageFileManager.loadImage(selectedFile);
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if(currentImage == null) { // image file was not a valid image
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JOptionPane.showMessageDialog(frame,
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"The file was not in a recognized image file format.",
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"Image Load Error",
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JOptionPane.ERROR_MESSAGE);
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return;
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}
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imagePanel.setImage(currentImage);
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setButtonsEnabled(true);
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showFilename(selectedFile.getPath());
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showStatus("File loaded.");
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frame.pack();
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}
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/**
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* Close function: close the current image.
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*/
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private void close()
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{
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currentImage = null;
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imagePanel.clearImage();
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showFilename(null);
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setButtonsEnabled(false);
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}
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/**
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* Save As function: save the current image to a file.
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*/
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private void saveAs()
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{
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if(currentImage != null) {
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int returnVal = fileChooser.showSaveDialog(frame);
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if(returnVal != JFileChooser.APPROVE_OPTION) {
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return; // cancelled
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}
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File selectedFile = fileChooser.getSelectedFile();
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ImageFileManager.saveImage(currentImage, selectedFile);
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showFilename(selectedFile.getPath());
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}
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}
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/**
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* Quit function: quit the application.
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*/
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private void quit()
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{
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System.exit(0);
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}
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/**
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* Apply a given filter to the current image.
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*
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* @param filter The filter object to be applied.
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*/
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private void applyFilter(Filter filter)
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{
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if(currentImage != null) {
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filter.apply(currentImage);
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frame.repaint();
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showStatus("Applied: " + filter.getName());
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}
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else {
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showStatus("No image loaded.");
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}
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}
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/**
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* 'About' function: show the 'about' box.
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*/
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private void showAbout()
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{
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JOptionPane.showMessageDialog(frame,
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"ImageViewer\n" + VERSION,
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"About ImageViewer",
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JOptionPane.INFORMATION_MESSAGE);
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}
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/**
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* Make the current picture larger.
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*/
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private void makeLarger()
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{
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if(currentImage != null) {
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// create new image with double size
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int width = currentImage.getWidth();
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int height = currentImage.getHeight();
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OFImage newImage = new OFImage(width * 2, height * 2);
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// copy pixel data into new image
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for(int y = 0; y < height; y++) {
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for(int x = 0; x < width; x++) {
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Color col = currentImage.getPixel(x, y);
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newImage.setPixel(x * 2, y * 2, col);
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newImage.setPixel(x * 2 + 1, y * 2, col);
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newImage.setPixel(x * 2, y * 2 + 1, col);
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newImage.setPixel(x * 2+1, y * 2 + 1, col);
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}
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}
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currentImage = newImage;
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imagePanel.setImage(currentImage);
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frame.pack();
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}
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}
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/**
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* Make the current picture smaller.
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*/
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private void makeSmaller()
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{
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if(currentImage != null) {
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// create new image with double size
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int width = currentImage.getWidth() / 2;
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int height = currentImage.getHeight() / 2;
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OFImage newImage = new OFImage(width, height);
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// copy pixel data into new image
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for(int y = 0; y < height; y++) {
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for(int x = 0; x < width; x++) {
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newImage.setPixel(x, y, currentImage.getPixel(x * 2, y * 2));
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}
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}
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currentImage = newImage;
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imagePanel.setImage(currentImage);
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frame.pack();
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}
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}
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// ---- support methods ----
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/**
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* Show the file name of the current image in the fils display label.
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* 'null' may be used as a parameter if no file is currently loaded.
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*
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* @param filename The file name to be displayed, or null for 'no file'.
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*/
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private void showFilename(String filename)
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{
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if(filename == null) {
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filenameLabel.setText("No file displayed.");
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}
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else {
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filenameLabel.setText("File: " + filename);
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}
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}
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/**
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* Show a message in the status bar at the bottom of the screen.
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* @param text The status message.
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*/
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private void showStatus(String text)
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{
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statusLabel.setText(text);
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}
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/**
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* Enable or disable all toolbar buttons.
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*
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* @param status 'true' to enable the buttons, 'false' to disable.
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*/
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private void setButtonsEnabled(boolean status)
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{
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smallerButton.setEnabled(status);
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largerButton.setEnabled(status);
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}
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/**
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* Create a list with all the known filters.
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* @return The list of filters.
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*/
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private List<Filter> createFilters()
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{
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List<Filter> filterList = new ArrayList<>();
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filterList.add(new DarkerFilter("Darker"));
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filterList.add(new LighterFilter("Lighter"));
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filterList.add(new ThresholdFilter("Threshold"));
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filterList.add(new InvertFilter("Invert"));
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filterList.add(new SolarizeFilter("Solarize"));
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filterList.add(new SmoothFilter("Smooth"));
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filterList.add(new PixelizeFilter("Pixelize"));
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filterList.add(new MirrorFilter("Mirror"));
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filterList.add(new GrayScaleFilter("Grayscale"));
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filterList.add(new EdgeFilter("Edge Detection"));
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filterList.add(new FishEyeFilter("Fish Eye"));
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return filterList;
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}
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// ---- Swing stuff to build the frame and all its components and menus ----
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/**
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* Create the Swing frame and its content.
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*/
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private void makeFrame()
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{
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frame = new JFrame("ImageViewer");
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JPanel contentPane = (JPanel)frame.getContentPane();
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contentPane.setBorder(new EmptyBorder(12, 12, 12, 12));
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makeMenuBar(frame);
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// Specify the layout manager with nice spacing
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contentPane.setLayout(new BorderLayout(6, 6));
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// Create the image pane in the center
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imagePanel = new ImagePanel();
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imagePanel.setBorder(new EtchedBorder());
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contentPane.add(imagePanel, BorderLayout.CENTER);
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// Create two labels at top and bottom for the file name and status messages
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filenameLabel = new JLabel();
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contentPane.add(filenameLabel, BorderLayout.NORTH);
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statusLabel = new JLabel(VERSION);
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contentPane.add(statusLabel, BorderLayout.SOUTH);
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// Create the toolbar with the buttons
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JPanel toolbar = new JPanel();
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toolbar.setLayout(new GridLayout(0, 1));
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smallerButton = new JButton("Smaller");
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smallerButton.addActionListener(e -> makeSmaller());
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toolbar.add(smallerButton);
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largerButton = new JButton("Larger");
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largerButton.addActionListener(e -> makeLarger());
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toolbar.add(largerButton);
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// Add toolbar into panel with flow layout for spacing
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JPanel flow = new JPanel();
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flow.add(toolbar);
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contentPane.add(flow, BorderLayout.WEST);
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// building is done - arrange the components
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showFilename(null);
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setButtonsEnabled(false);
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frame.pack();
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// place the frame at the center of the screen and show
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Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
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frame.setLocation(d.width/2 - frame.getWidth()/2, d.height/2 - frame.getHeight()/2);
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frame.setVisible(true);
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}
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/**
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* Create the main frame's menu bar.
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*
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* @param frame The frame that the menu bar should be added to.
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*/
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private void makeMenuBar(JFrame frame)
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{
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final int SHORTCUT_MASK =
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Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
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JMenuBar menubar = new JMenuBar();
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frame.setJMenuBar(menubar);
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JMenu menu;
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JMenuItem item;
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// create the File menu
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menu = new JMenu("File");
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menubar.add(menu);
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item = new JMenuItem("Open...");
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item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, SHORTCUT_MASK));
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item.addActionListener(e -> openFile());
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menu.add(item);
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item = new JMenuItem("Close");
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item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, SHORTCUT_MASK));
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item.addActionListener(e -> close());
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menu.add(item);
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menu.addSeparator();
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item = new JMenuItem("Save As...");
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item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, SHORTCUT_MASK));
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item.addActionListener(e -> saveAs());
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menu.add(item);
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menu.addSeparator();
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item = new JMenuItem("Quit");
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item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK));
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item.addActionListener(e -> quit());
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menu.add(item);
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// create the Filter menu
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menu = new JMenu("Filter");
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menubar.add(menu);
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for(Filter filter : filters) {
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item = new JMenuItem(filter.getName());
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item.addActionListener(e -> applyFilter(filter));
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menu.add(item);
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}
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// create the Help menu
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menu = new JMenu("Help");
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menubar.add(menu);
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item = new JMenuItem("About ImageViewer...");
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item.addActionListener(e -> showAbout());
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menu.add(item);
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}
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}
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